Rolling dam



Sept. 12, K QE 1,926,819

ROLLING DAM Filed June 11, 1928 2 Sheets-Sheet 1 INVENTOR K. SCHOENROLLING DAM Sept. 12, 1933.

2 Sheets-Sheet 2 Filed June 11, 1928 INVENTOR.

Patented Sept. 12, 1933 if i I 1,926,819

PATENroFFicE ROLLING DAM Karl Schoen, Wuerzburg, Germany ApplicationJune 11, 1928, Serial No. 284,645, and

.in Germany October 11, 1926 4 Claims. (01. 61-22) This inventionrelates to rolling dams and it is an object of the invention to providein a dam structure a retaining member forming a tight joint against thebottom in connection with a main body that is mounted to roll on thewall piers. Y

The invention is furthermore designed to eliminate certain "faults anddefects. notable among which are a tendency to obstruct the surfacewater passages by mud and to freeze at r the joints when the water islow.

Another advantage of the invention resides in that it obviates specialshaping of the bottom of the dam to fit the form of the retaining memberand further objects are found in simplicity of construction, and lowcostof manufacture and installation.

Still another object of the invention is to provide a dam of the abovedescribed character,

a which permits of a variation in the retaining level without deepeningthe dam bottom.

The above and other objects are attained by providing a retainingmember, making a tight:

joint with the bottom, in the form of a shield movably mounted on themain body and pressed downwardly against the dam bottom by the water.The lower end of. the retaining member may be connected with the mainbody by'links and the upper end by transmission elements coming'intooperation as the dam rolls,or the connection between the shield and thebody may be made by links additional to the others or by links forming arigid whole with. the shield.

In the accompanying drawings in the various views of which like partsare similarly designated,

Figure 1 represents a front elevation of the dam 7 structure inoperative relation to the wall piers;

Figure 2, a cross-sectional elevation of the dam of the first abovestated construction. taken in a plane indicated by the line 2-2 inFigure 1, and

drawn to a larger scale;

. Figure 3, a similar section showing the parts in a diiferentposition;. I

Figures 4 and 5, similar sectional elevations in tion, but the shield 18is at its lower part formed two difierent positions, of a dam modifiedin con-.

piers A. The body 1 is provided with a retaining Wall 4 the lower end.of which, when the dam is in retaining position, is curved cycloidallyand at its upper end has a guide wall 5, preferably of wood. I

The tight joint at the bottom is made by a shield 6, the lower end ofwhich, carrying the joint or packing beam '7 is secured by links 8 tothe body on its side away from the water when ;in retaining position,and the upper end 5 of which carries bracket socket bearings orabutments 9 which cooperate with bearings or stops 10 mounted on thewall 4. 7

At the upper end of the shield 6, a spring packing plate 11 is provided,carrying a packing bar 12 ,in contact with the face of the wall 4. Apartof the water pressure acting on the shield 6 is transmitted to theretaining wall 4 by the noses 13 of the bearings 9.

In order to relieve the load on the dam operating means, notshown,-hooks 14 are provided on the disks 2 to be engaged by yokes 16,carried by vertically adjustable spindles 15.

In the position shown in Figure'l, the dam has its maximum effectiveheight. If this is reduced or ice and drift material is to be let 01f,the spindles 15 with yokes 16 are first lowered a cer-, tain amount.Then the driving mechanism is stopped until the hooks 14' again engagein the yokes 16 as shown in Figure 2 35 As the body 1 is lowered, thewall 4 slides over the packing bar 12 and over the noses13. Inconsequence of the cycloidal shape of the wall. 4, the shield 6maintains its position in space and the packing plate 1l12 slides on thewall as the latter moves. r

In the modified form illustrated in Figures 4 and 5, the main body 17 isalso of triangular secintegral with the links 19. In consequence of therigid construction of the shield with the links, the wall 20 of the body1'7 remains entirely free from the water pressure acting on the shield,since said pressure is transmitted from the shield di-' rectly to thepivots of the links.

In this form, furthermore, the upper part of the wall 20 represented bythe nose 20, in the lowered positionof the body 17 (see Figure 5)projects beyond the lower part of the wall, which 5 results in that thewater pressure loading the upper part, assists in raising the body.

In the modified form of the invention illustrated in Figure 6, the wall21 can also berelieved from pressure by connecting the shield with theoscillating body 25 by pairs of links 23-24.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A dam of the character described comprising a shield adapted toengage the bottom of a, channel, the shield being pivotally held at oneside and free to move at the vopposite side, and a relatively movableretaining wall behind the shield with regard to direction of flow ofwater in a stream in which the dam is placed, the free side of theshield being disposed to abut against the retaining wall by the pressureof water in the stream.

KARL SCHOEN.

